On drum level, why we are using air to close Control valve?
Answer Posted / carl_ellis
If the valve's actuator is Air-to-Close, what state does it
fail-safe state?
Check out the article, "How to destroy a boiler - Part 1"
at this link:
http://www.nationalboard.org/index.aspx?pageID=164&ID=238
and scroll down a couple pages to the section entitled "Low
Water Conditions".
The description will provide details that help you
understand what the fail-safe state due to the loss of a
control signal on a boiler feedwater control valve should
be.
Carl Ellis
Measure First
Is This Answer Correct ? | 4 Yes | 3 No |
Post New Answer View All Answers
Explain the combusion chamber
sir, give me placement papers and interview quistion of birla group company of copper.
Differentiate between ultrasonic flowmeter and radar type flow meter
i want formula for flow control.am doing project in flow control using orifice . i know value of the flow level(Q) . upstream(p1) pressure, orifice diameter(Do) , pipe diameter(Di) and oil viscosity(Vi) how can i calculate downstream pressure
what is a good line as ic engineer as maintenance ,oc, project, calibration ,validation engineer?
Why grounding is necessary? Give example with diagram.
kindly sent some demo question and answer
key exchanges in wpa,wpa2,tls
Explain why plc require in analog input 4-20amp & 0-10 volt?
what effects a surging can produce in the compressor
i have done DAE in Instrumentation and Process Control. i have applied for an apprentice training in chemical company after three day my interview will be conduct but i need more information about industrial process control and controller. my e mail is imran_dilsetu@yahoo.com please tell me interview question relative to instrumentation ?
What are the error values can accepted in flow transmitter calibration?could u give any formula for this?
Hi Friends , i need one urgent help , i am preparing for M.tech entrance examination , i need some obejective questions related to instrumentation field. where can i get those ? can anyone help me pls ?
what is the vital subject for scoring bhel exam&what is the question pattern
how do i tune dearator pr control valve using PID. we set the set point is 0.6kg/cm2 now i want 0.5 to 0.7kg/cm2 limits so what should i give p,i,d values. then pls explain how do set pid values for control valve tuning?